The Meaning Of 10BaseT:

Short forms like 10BaseT are used for specifying types of network
cabling. Here's what each part of the short form means:

The first number is the transmission speed of the medium in mbps. So,
10BaseT cabling can handle 10 mbps.

The "Base" specifies baseband. The alternative is "Broad" for broadband.

Lastly, the last part of the name can be either a number or the letter T.
If it's a number, the number specifies the maximum length of a single
cable segment (in units of 100 metres). If it's a letter T, that indicates
that the cable uses twisted-pair wiring. (If it's a number instead of a
letter, the two most common specs are 10Base2 and 10Base5, which are
often called "thin Ethernet" (or "Thinnet") and "thick Ethernet" (or
"Thicknet"), respectively. Both of these use coaxial cable.)